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Pong: Ricochet off Paddle Issue

I've had this old program laying around from when I first started programming, so I decided to optimize it up a little bit.. Everything works great now.. However, I can't get the stinkin' ball to bounce off the paddle. It does funny things sometimes I start up the program, and does absolutely nothing other times I start it (I can go into further detail if needed).. Just to triple check my logic.. here's the method: